Stone-dressing machine



(No Model.)

J. MANN.

STONE DRESSING MACHINE.

Pmtenied May 13, 1884.

Fig. .2

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JON ATH A N MANN, OF MILTON, M ASSAOHUSETTS.

STONE-DRESSING MACHINE.

EPECIFICA'IION forming part of Letters Patent No. 298,598, dated May 13, 1884-.

Application filed February 13, 1888. X model.)

To all whom it may concern:

Be it known that LJoNATflAN MANN, of Milton, county of Norfolk, State of Massachusetts, have invented an Improvement in StoneDress ing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention relates to a machine for dress- 1 ing stone, and has for its object to impart to the rough stone as it comes from the quarry a squared-up or properly shaped and finished surface at a single operation. In a machine for effecting this the cutter-carriage is pro- I 5 vided with aseries of cutters adapted to be re ,ciprocated across the surface of the stone, the said cutters being set to act upon the stone at different depths, so that the one first meeting the stone removes the larger inequalities,

2o bringingits surface to about the shape desired, while the succeeding ones act upon the surface thus partly dressed, the last one of the series leaving it with a surface similar to that produced by the usual bush-hamm ers and of equal 2 or greater fineness.

Now, my invention consists in the means employed for holding the cutters upon the carriage and adjusting their position with relation thereto.

Figure 1 is an end elevation of a sufficient portion of a stone-cutting machine to illustrate this invention; Fig. 2, a plan view of the cutter-carriage and cutters thereon; Fig. 3, alongitudinal section thereof on line 00 00, Figs. 1

and 2; Fig. 4, a transverse section on line yy, Fig. 3, of one of the cutters and its holdingshank; Fig. 5, a modification of one of the cutter-holding shanks; Fig. 6, an edge view thereof showing a different form of cutter,

and Fig. 7 a modification of the means for mounting the cntter-shankin the carriage and a modified form of cutter for producing very highly-finished work.

The bed a, for supporting the stone Z) and presenting it to the cutters, and the upright frame-work c, for supporting the cutter-carriage, may be of any usual construction, they forming no part of the present invention.

The upright framework 0 is provided with a guide, (2, in which the cutter-carriage e is reeiprocated transversely to the movement of the stone 1) with the bed a. The said guideway (2 is made vertically adjustable upon the uprights c by means of the screws f, actuated by gearing g from the shaft h, adapted to be rotated in either direction by the pulley z.

The carriage e is provided with anti-friction rollers 7; where it runs on the guiding flange or track (1 at the upper edge of the guide 61, and it is shown in this instance as reciprocated back and forth transversely to the stone by means of a connecting-rod, 6' connected with a rocking lever, c", actuated by a pitman, c and wrist-plate c". The connection of the said pitman and wrist-plate and that of the lever e and link 6 are adjustable, so as to vary the travel of the carriage ein accordance with the width of the stone being acted upon. The carriage c is also provided with anti-fricti0n rollers at its rear end, which run on a track, dflupon the guideway d, theyreceiving the pressure of the stone as it is forced against the cutters by the movement of the bed a.

The cutters m are shown as sharpedged disks mounted on studs m, (see Fig. 4,) having a bearing, m", in the euttercarrying shank a, passing through openings 3 in the cuttercarriage c, as shown in Fig. 3. The, said shanks a are fastened upon the said carriage by bolts 0, passing through slots 4 in the said shanks n, so that the cutters maybe caused to project a greater or less distance below the under surface of the carriage, as may be desired, they being adjusted and retained in the proper position by adjustingserews 19, passing longitudinally through the said shanks and bearing against the sides of the bolts 0, as best shown in Fig. 3. The angle at which the cutters are presented to thestone may be adj usted by rocking their shanks n in their recesses 8, wedgeshaped blocks or followers 0' being interposed between the said shanks and the carriage to determine the angular position of the cutters.

The carriage c is shown as provided with a 5 lip or projection, 8, upon which the lower portion of the cutter-shank rests, the said projection serving as a fulcrum for the rocking movement of the shank; and it'will be seen that rocking the shank on the said fulcrum 100 varies not only the angle at which the cutter is presented to the stone, but also the distance of the cutting-edge below the carriage, or, in other words, the depth to which the cutter acts upon the stone so that the said depth can be adjusted by varying the position of the follower '1'.

If desired, the cutters may be adjusted only by the rocking movement, in which case their shanks a may be pivoted upon a spindle, 8, (see Fig. 7,) passing through the said shank, instead of the lip s, supporting the shank at its side, and the longitudinal adjustment may also be made in this construction by having the spindle s mounted in an elongated passage or slot, either in the shank a or the carriage c, the said spindle then bearing upon adjustingscrews 9 operating as the equivalent of the screws 1) employed in eoimectiou with the bolts 0.

The carriage c is provided with a series of cutters, m, shown in this instance as arranged in pairs, acting one in advance of the other upon the stone as it progresses upon its bed in the direction of the arrow 5, Fig. 3, the said cutters at the same time moving backward and forward transversely to the stone as it progresses. The cutters which first act upon the stone, as shown at A, Fig. 3, are set higher than the succeeding pair at B, and will generally cut to a greater depth, they being intended to remove the larger irregularities of the stone as it comes from the quarry. The succeeding pair of cutters, at B, are set somewhat lower, and remove a smaller portion of the stone, bringing it to about the desired shape, while the third set, at 0, remove only fine chips, leaving the stone with a finished surface similar to that produced by the ordinary hand-operated bush-hammers, it being possible to produce a finish equal to that of the best hand-work.

hen a finer finish is desired than can be derived from the rotating cutters m, chisellike cutters m", Fig. 7, may be employed to act upon the stone after the rotating cutters, they merely operating to scrape or rub the surface without removing any considerable portion of the stone.

The shanks a may, if desired, be provided with two or more of the cutters m, as shown in Figs. 5 and 6, where the cutters are also represented as set in slots in the end of the shank instead of running on a stud at the side thereof. The cutters on may have their edges beveled on both sides, as shown in Fig. 6, in

which case they will be sharpened by the action of the stone itself, theybeing turned from time to time, so as to present first one and then the other beveled face to the stone.

The guideway (Z for the cutter-carriage is shown as partly counterbalanced by a weight, \V, and the said guideway has a flange, d, on its lower edge, to support the weight of the carriage 0 when it is not in operation, it being supported wheu'operating upon the stone by the reaction of the stone upon the cutters, which tend to lift the carriage and cause it to bear upon the upper flange, d, of the said guide.

I do not desire to limit my invention to the employment of any particular number of sets of cutters, as the number may be varied in accordance with the character of the stone or the finish desired; nor is it essential that the stone should be passed through the machine only a single time, as in the ease of very irregular stones it may be desirable to pass them through more than once.

The essential feature of this part of my invention consists in employing different cutters acting at the same time each upon the portion of the stone left by the one in advance, so that different steps in the shaping and finishing of the stone are performing during a single presentation of the stone to the cutters.

1. The cutter carriage, cutters, cuttershanks slotted longitudinally, and pivots for such shanks on which they may be rocked and moved longitudinally, combined with the fastening-bolts for such shanks, and the wedgeshaped followers beneath such shanks, whereby the angular position of the cutters and their depth below the carriage may be adjusted, substantially as shown and described.

2. The combination, substantially as shown and described, of the cutter-carriage, the cutters, the longitudinally-slotted shanks therefor, the pivots for such shanks, upon which they receive a longitudinal and rocking movement, the wedge-shaped followers for fixing the shanks in their rocking movement, and the fastening-bolts for fixing them in their longitudinal movement, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JONATHAN MANN.

\Vitnesses:

Jos. 1. LIVERMORE, \V. H. Sres'rox. 

